From 9406b485dea5e25bed7c81cd822747d494cc8bde Mon Sep 17 00:00:00 2001 From: Yonghong Song Date: Sat, 9 May 2020 10:59:20 -0700 Subject: tools/bpftool: Add bpf_iter support for bptool Currently, only one command is supported bpftool iter pin It will pin the trace/iter bpf program in the object file to the where should be on a bpffs mount. For example, $ bpftool iter pin ./bpf_iter_ipv6_route.o \ /sys/fs/bpf/my_route User can then do a `cat` to print out the results: $ cat /sys/fs/bpf/my_route fe800000000000000000000000000000 40 00000000000000000000000000000000 ... 00000000000000000000000000000000 00 00000000000000000000000000000000 ... 00000000000000000000000000000001 80 00000000000000000000000000000000 ... fe800000000000008c0162fffebdfd57 80 00000000000000000000000000000000 ... ff000000000000000000000000000000 08 00000000000000000000000000000000 ... 00000000000000000000000000000000 00 00000000000000000000000000000000 ... The implementation for ipv6_route iterator is in one of subsequent patches. This patch also added BPF_LINK_TYPE_ITER to link query. In the future, we may add additional parameters to pin command by parameterizing the bpf iterator. For example, a map_id or pid may be added to let bpf program only traverses a single map or task, similar to kernel seq_file single_open(). We may also add introspection command for targets/iterators by leveraging the bpf_iter itself. Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200509175920.2477247-1-yhs@fb.com --- tools/bpf/bpftool/main.h | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/bpf/bpftool/main.h') diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h index 9b1fb81a8331..a41cefabccaf 100644 --- a/tools/bpf/bpftool/main.h +++ b/tools/bpf/bpftool/main.h @@ -199,6 +199,7 @@ int do_feature(int argc, char **argv); int do_btf(int argc, char **argv); int do_gen(int argc, char **argv); int do_struct_ops(int argc, char **argv); +int do_iter(int argc, char **argv); int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what); int prog_parse_fd(int *argc, char ***argv); -- cgit v1.2.3